condition mean min max ZT0-3 2015.6 2015.6 2015.6 ZT4-7 2010.8 2010.8 2010.8 ZT8-11 1618.9 1618.9 1618.9 ZT12-15 1760.35 1760.35 1760.35 ZT16-19 1808.4 1808.4 1808.4 ZT20-23 1671.25 1671.25 1671.25